/**
 * @file ScosTime/gui.h
 * @brief GUI for the ScosTime application
 * @author Enar Vaikene
 *
 * Copyright (c) 2012 Enar Vaikene
 *
 * This file is part of the eVaf C++ cross-platform application development framework.
 *
 * This file can be used under the terms of the GNU General Public License
 * version 3.0 as published by the Free Software Foundation and appearing in
 * the file LICENSE included in the packaging of this file. Please review the
 * the following information to ensure the GNU General Public License version
 * 3.0 requirements will be met: http://www.gnu.org/copyleft/gpl.html.
 *
 * Alternatively, this file may be used in accordance with the Commercial License
 * Agreement provided with the Software.
 */

#ifndef __SCOSTIME_GUI_H
#  define __SCOSTIME_GUI_H

#include <Plugins/iPlugin>

#include <QObject>
#include <QString>
#include <QDateTime>

class QLineEdit;
class QComboBox;
class QRegExp;
class QPushButton;

namespace eVaf {
namespace ScosTime {

namespace Internal {

/**
 * SCOS date/time class
 */
class DateTime
{
public:

    /// Type of the date/time entry
    enum Type
    {
        Invalid,
        ASD,
        ISO,
        CUC
    };

    /**
     * Creates an invalid date/time value with the default epoch
     */
    DateTime();

    /**
     * Dtor
     */
    ~DateTime();

    /**
     * Sets the date/time value from a string.
     * @param s Input string
     * @param epoch Epoch
     * @return Type of the input string
     *
     * The input string can be:
     * @li Date/time in ISO format yyyy-MM-ddThh:mm[:ss[.zzz]]
     * @li Date/time in ASD format yyyy.ddd.hh.mm[.ss[.zzz]]
     * @li CUC hex string cccccccc[ffff]
     *
     * If the string is invalid, creates an invalid date/time value.
     */
    Type setDateTime(QString const & s, QDateTime const & epoch);

    /**
     * Sets the date/time value from a string using the previously set epoch.
     * @param s Input string
     * @return Type of the input string
     *
     * The input string can be:
     * @li Date/time in ISO format yyyy-MM-ddThh:mm[:ss[.zzz]]
     * @li Date/time in ASD format yyyy.ddd.hh.mm[.ss[.zzz]]
     * @li CUC hex string cccccccc[ffff]
     *
     * If the input string is invalid or no epoch is set, creates an invalid
     * date/time value.
     */
    Type setDateTime(QString const & s);

    /**
     * Sets the epoch
     * @param epoch Epoch
     */
    void setEpoch(QDateTime const & epoch);

    /**
     * Returns the current epoch
     */
    QDateTime const & epoch() const { return mEpoch; }

    /**
     * Returns true if the date/time value is valid.
     */
    bool isValid() const { return mDateTime.isValid(); }

    /**
     * Returns the type of the date/time string from which the date/time
     * value was created.
     */
    Type type() const { return mType; }

    /**
     * Returns the current date/time value
     */
    QDateTime const & dateTime() const { return mDateTime; }

    /**
     * Returns the date/time value a string in the ISO format yyyy-MM-ddThh:mm:ss.zzz
     */
    QString asISOstring() const;

    /**
     * Returns the date/time value as a string in the ASD format yyyy.ddd.hh.mm.ss.zzz
     */
    QString asASDstring() const;

    /**
     * Returns the date/time value as a CUC hex string in the format ccccccccffff
     */
    QString asCUChexString() const;


private: // methods

    Type getDateTimeType(QString const & s) const;

    QDateTime strToDateTime(QString const & s, Type t) const;


private: // members

    /// Type of the input string
    Type mType;

    /// Epoch
    QDateTime mEpoch;

    /// Date/time value
    QDateTime mDateTime;

    /// Regular expression for ISO date/time strings
    QRegExp * mRxIso;

    /// Regular expression for ASD date/time strings
    QRegExp * mRxAsd;

    /// Regular expression for CUC date/time strings
    QRegExp * mRxCUC;

};

} // namespace eVaf::ScosTime::Internal

/**
 * Graphical User Interface for the ScosTime application.
 *
 * This module adds a GUI window to the ScosTime application using the SdiWindow module.
 */
class Module : public Plugins::iPlugin
{
    Q_OBJECT
    Q_INTERFACES(eVaf::Plugins::iPlugin)

    enum ValidEntry
    {
        NoValidEntry,
        DateTimeEntry,
        CUCEntry
    };

public:

    Module();

    virtual ~Module();

    virtual bool init(const QString & args);

    virtual void done();

    virtual bool isReady() const { return mReady; }


private slots:

    void epochChanged(QString const & s);

    void dateTimeClicked();

    void dateTimeEdited(QString const & s);

    void cucHexEdited(QString const & s);


private: // Methods


private: // Members

    /// Flag indicating that the module is ready
    bool mReady;

    /// Current date/time value
    Internal::DateTime mDateTime;

    /// Last date/time format type used in the date/time entry field
    Internal::DateTime::Type mLastDateTimeType;

    /// Widgets on the screen
    QComboBox * wEpoch;
    QLineEdit * wDateTime;
    QPushButton * wConvertDateTime;
    QLineEdit * wCucHex;

};

} // namespace eVaf::ScosTime
} // namespace eVaf

#endif // gui.h